Chemistry For Life: Developing Fuels

Developing Fuels: Chemistry For Life

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  • Created by: Emma
  • Created on: 20-04-10 16:52


Exothermic: Describes a process which emits energy.

Endothermic: Describes a process which absorbs energy.

Enthalpy Change of Combustion: The process when one mole of a compound is completely burnt in excess oxygen.

Enthalpy Change of Formation: The process when one mole of a compound is formed from it's elements in their standard states.

Enthalpy Change of Reaction: The energy change at a constant pressure and a stated temperature for a process in which a specified amount of reactants are converted into products.

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Entropy: The measure of the number of ways particles can be arranged.

Catalyst: A substance which changes the rate of a chemical reaction without undergoing any change itself.

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Energy Changes and Chemical Reactions

  • Exothermic reactions give out heat and have negative enthalpy changes.
  • When a reaction gives out heat the chemical reactants are losing energy so the products end up with less energy than what the reactants had.


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  • Endothermic reactions take in heat and have positive enthalpy changes.
  • In an endothermic reaction the reactants take in energy from their surroundings so the products end up with more energy than what the reactants had.


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